Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/html/HTMLFormElement.idl

Index: third_party/WebKit/Source/core/html/HTMLFormElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLFormElement.idl b/third_party/WebKit/Source/core/html/HTMLFormElement.idl
index 0e0e4f2ed73918ec565202bfb786a0640424f573..9e054c4fbc6d67354be6db71d241d06de6803be8 100644
--- a/third_party/WebKit/Source/core/html/HTMLFormElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLFormElement.idl
@@ -37,10 +37,10 @@
     readonly attribute long length;
     [ImplementedAs=item] getter Element (unsigned long index);
     // FIXME: This getter should not have [NotEnumerable].
-    [NotEnumerable] getter (RadioNodeList or Element) (DOMString name);
+  [Measure, NotEnumerable] getter (RadioNodeList or Element) (DOMString name);
 
     [ImplementedAs=submitFromJavaScript] void submit();
     [CEReactions, CustomElementCallbacks] void reset();
-    boolean checkValidity();
-    boolean reportValidity();
+    [MeasureAs=ValidationAPI] boolean checkValidity();
+    [MeasureAs=ValidationAPI] boolean reportValidity();
 };